Combined water and air heating apparatus



No Model.)

T. A. MACDONALD.

GOMBINBDWATER AND-AIR HEATING APPARATUS.

No. 829,923. Patented Nov. 10, 1885.

Unirse "rares rtree.,

A'rnNr COMBINED WATAER AND AIR HEATING APPARATUS.

SPECEFECATEGN forming part of Letters Patent No. 329,923, dated November l0, 1885.

Application filed October 20, 1884.

T0 all whom, it may concern.-

Be it known that I, THOMAS A. MAcDoN- ALD, a citizen of Canada, residing at Boston, in thecounty of Suffolk and State of Massachusetts, have invented a new and useful Improvement in Combined Vater and Air Heating Apparatus, of which the following is a specification.

My invention relates to an improvement in combined hot-water and hot-air heating appa ratus whereby I gain the following advantages-Viz., economy of construction and in the use of fuel, durability, efciency,and simplicity of operation, and also safety and facility of management, and resulting in the production of a pure warm atmosphere, and also in which the air shall not be injuriously affected by being broughtin contact with surfaces of high temperature.

Referring to the accompanying drawings, Figure l is a vertical section of an apparatus embodying my invention. Fig. 2 is a section, on a line at the top of the boiler, of Fig. l. Fig. 3 is a plan or top view of the fire-pot and surrounding water-chamber.

A is an upright tubular boiler resting upon the inner edge of the water-chamber G,which surrounds the fuel and combustion chamber WV. The outer lower portion of boiler A is connected to the upper ends of the water-chainber G by means of iianged elbows or fittings F, which are securely bolted to the boiler and water-chamber, and through which the water passes freely.

B is a thin wrought-iron casing having its seams riveted and callred,so as to be perfectly air-tight, and serves as a hot-air radiator. The said casing rests upon the outer edge of the water-chamber G.

D is an outer casing, of thin galvanized iron, surrounding the entire apparatus at the sides and top, with the exception of the necessary openings, and leaving a space, O, between it and the casing B for the passage of air,which enters the inlet-opening N and passes around the water-chamber G and the radiator B to the chamber T and out through opening M. The air will thus be heated by Contact with or absorbing the heat given off by the casting B, thereby utilizing heat which is ordinarily lost or wasted in hot-air boilers. The

ScrialNo.1-IG,040. (No model.)

heated air passing from chamber T through outlet M is distributed through pipes to rooms, as required. The hot water passes from boiler A up through the pipe P to radiators in the building, aud as it becomes cool is conducted back by means of suitable pipes to the waterchamber through pipe y. The products of combustion pass up from the combustionchamber W through the tubes H of boiler A into the space or chamber E, and, when the damper n in the exit S is closed, down into and through the chamber or space E, and escapes through the eXit R to the smoke-flue. The damper n in exit S is to be opened when the fire is first started, so as to increase the draft. Over one-half of the space of the lower part of the chamber E', and between the top of the boiler and the casing C, is a semicircular thin iron plate, m", which deiiects the products of combustion and causes the same to pass around the sides of the boiler before escaping through the exit R. It will be seen that as the boiler A sits immediately over the combustion-chamber, and the water-chamber Gsurrounds the re-pot and combustion-chamber, the water will absorb the intense heat, and only the milder gases will coinein contact with the hot-air radiatorB, and,consc,quently, the air heated by said radiator is not injuriously affected, as in the ordinary hot-air furnace, where the whole heat of the fire, Src., comes in contact with the radiator, while the radiator in my apparatus, not being exposed to an intense heat, is not so liable to become porous, and thus allow the escape of gas through the same. The top ofthe casing B is made of thin steel-plate, the shell or upright part being wrought-iron. The seams are riveted and calked,so as to be perfectly air-tight, thus preventing the gases from getting into the hotair-chamber.

It will be seen that as the products of combustion are exposed to the casing B, after passing through the tubes in boiler A, the heat which could not be abstracted by the boiler is absorbed by the air in space C, which is of a lower temperature than the contents of the boiler, and thus economy in the use of fuel is attained.

I am aware of the construction of the boiler in the patent of J. Mason, No. 259,566, June 13, 1882, and also of the steam-boiler fire-tube the easing B resting upon the outer edge ofthe shown in the German patent to Quint, N o. water-chamber G and inclosing the spaeeE E', 16,069. These I do no claim; but substantially as shown and described.

What I claim as my invention is- In testimony whereof I have signed my name 5 In a combined hot-water and hot-air heating to this speeieationin the presence of two sub- 15 apparatus, the combination of the tubular seribing witnesses.

boiler A, water-ohamberG, and easing B, the THOMAS A. MAODON ALD. lower edges of the lboiler resting upon the up- Witnesses: per inner edge of the water-chamber, the two J. H. ADAMS,

o being connected by the curved fittings F, and E. PLANTA. 

